GCSE Electricity quiz - by J Catchpole

Current, Voltage and Resistance

1.) Which of the following statements is NOT true about electricity?

Current is the flow of electrons around a circuit.

Voltage is the driving force that pushes the current around a circuit.

Resistance is the force opposing the flow of current around a circuit.

If you decrease the Resistance, then less current will flow.

2.) Electric current will only flow if there are charges that can move freely. Metals contain many free electrons, which allows electric current to flow so well in them. Which way do electrons flow in a circuit?

-ve to +ve, the opposite way to conventional current.

-ve to +ve, the same way as conventional current.

+ve to -ve, the opposite way to conventional current.

+ve to -ve, the same way as conventional current.

3.) Electrolytes are liquids that contain charges, which can move freely. They are either ions dissolved in water, like salt solution, or molten ionic liquids. When a voltage is applied to an electrolyte, which way do the charges move?

Negative charges towards the -ve electrode, Positive charges towards the +ve electrode.

Negative charges towards the +ve electrode, Positive charges towards the -ve electrode.

All from the +ve electrode to the -ve electrode.

All from the -ve electrode to the +ve electrode.

4.) Study the diagram carefully. A stream of electrons is made to pass through a narrow slit and then through two parallel plates. The electrons are seen to make a downwardly curved path. Which of the following is the most likely reason why the electrons take such a path through the plates?

Air resistance causes the electrons to slow and fall down.

The electrons lose energy and fall under the influence of gravity.

Plate X has a Positive potential relative to Y.

Plate Y has a Positive potential relative to X.

Circuits

5.) An ammeter measures current in amps. Where should it be placed in a circuit?

An ammeter should be placed in series, anywhere in a circuit, but never in parallel like the voltmeter.

An ammeter should be placed in parallel, around the component under test.

An ammeter can be placed either in series anywhere in a circuit, or in parallel like the voltmeter.

An Ammeter should be placed in series, anywhere in a circuit and in parallel around the component under test.

6.) A voltmeter measures potential difference in volts. Where should it be placed in a circuit?

A voltmeter must always be placed in parallel around the component under test.

A voltmeter should be placed in series, anywhere in a circuit, but never in parallel like the ammeter.

A voltmeter can be placed either in series anywhere in a circuit, or in parallel like the ammeter.

A voltmeter should be placed in series, anywhere in a circuit and in parallel around the component under test.

7.) Study the diagrams carefully. Which one shows the ammeter and voltmeter correctly placed in the circuit?

a

b

c

d

8.) The diagrams show Voltage - Current graphs. Which of the following is the correct component's for each graph?

A - Diode, B - Different Filament Lamps, C - Wire, D - Resistor.

A - Filament Lamp, B - Different Resistors, C - Diode, D - Wire.

A - Wire, B - Different Diodes, C - Resistor, D - Filament Lamp.

A - Resistor, B - Different Wires, C - Filament Lamp, D - Diode.

9.) A circuit has two cells, each having a voltage of 1.5 Volts. The current flowing is measured to be 50 milliamps (0.05 Amps). What is the total resistance in the circuit?

60 Ohms.

30 Ohms.

0.06 Ohms.

0.03 Ohms.

10.) A voltage - current graph is plotted with voltage along the horizontal axis (x), and current up the vertical axis (y). Which of the following statements is NOT true about resistance on this graph?

If the line curves, this implies a changing resistance.

Resistance is equal to the gradient of the line.

The steeper the line, the lower the resistance is.

The higher the resistance, the less steep the line is.

Circuit Symbols and Devices

11.) Which of the following are the correct names for the symbols in the diagram?

A - Battery, B - Cell, C - Capacitor, D - AC Power Supply.

A - AC Power Supply, B - Capacitor, C - Battery, D - Cell.

A - Capacitor, B - AC Power Supply, C - Cell, D - Battery.

A - Cell, B - Battery, C - AC Power Supply, D - Capacitor.

12.) Which of the following are the correct names for the symbols in the diagram?

A - Switch Open, B - Switch Closed, C - Resistor, D - Variable Resistor.

A - Variable Resistor, B - Resistor, C - Switch Open, D - Switch Closd

A - Resistor, B - Variable Resistor, C - Switch Closed, D - Switch Open.

A - Switch Closed, B - Switch Open, C - Variable Resistor, D - Resistor.

13.) Which of the following are the correct names for the symbols in the diagram?

A - Galvanometer, B - Motor, C - Voltmeter, D - Ammeter.

A - Ammeter, B - Voltmeter, C - Galvanometer, D - Motor.

A - Voltmeter, B - Ammeter, C - Motor, D - Galvanometer.

A - Motor, B - Galvanometer, C - Ammeter, D - Voltmeter.

14.) Which of the following are the correct names for the symbols in the diagram?

A - Filament Lamp, B - Heater, C - Loudspeaker, D - Fuse.

A - Fuse, B - Loudspeaker, C - Filament Lamp, D - Heater.

A - Loudspeaker, B - Fuse, C - Heater, D - Filament Lamp.

A - Heater, B - Filament Lamp, C - Fuse, D - Loudspeaker.

15.) Which of the following are the correct names for the symbols in the diagram?

A - Light Dependant Resistor, B - Thermistor, C - Light Emitting Diode, D - Diode.

A - Diode, B - Light Emitting Diode, C - Light Dependant Resistor, D - Thermistor.

A - Light Emitting Diode, B - Diode, C - Thermistor, D - Light Dependant Resistor.

A - Thermistor, B - Light Dependant Resistor, C - Diode, D - Light Emitting Diode.

16.) Which of the following electronic components below can be adjusted to alter the current flowing through a circuit?

Fixed Resistor.

Variable Resistor.

Filament Lamp.

Fuse.

17.) Which of the electronic components below can be used to store charge and energy?

A Thermistor.

A Diode.

A Capacitor.

A Transistor.

18.) An electronic circuit is to be designed so it will turn a fan on when the temperature gets above a certain value. Which of these components must it contain?

Diode.

Light Emitting Diode.

Thermistor.

Light Dependant Resistor.

19.) Which of the following statements is NOT true about Diodes?

They allow current to flow through them in any direction.

They are made from a semiconductor material such as silicon.

They have a very high resistance in one direction.

A diode that gives out light is called a Light Emitting Diode.

20.) Electric meters can be used to measure current and potential difference. Which of the following cannot be used as an electric meter?

Ammeter.

Voltmeter.

Water flow meter.

Galvanometer.

21.) Street lamps automatically turn on when the level of light falls below a certain value. Which component should the electrical circuit of a street lamp contain?

Diode.

Thermistor.

Light Dependant Resistor.

Light Emitting Diode.

22.) A simple rain detector circuit contains a buzzer that sounds when rain falls on the circuit contacts. What can be concluded about rain drops from this?

They conduct electricity.

They have zero resistance.

They are denser than air.

They have electric charge.

Series Circuits

23.) Study the diagrams carefully. Which of the circuits has all the lamps connected in series?

a

b

c

d

24.) Which of the following statements is NOT true about series circuits?

The same current flows through all parts of the circuit.

The dof the supply is shared between all components in the circuit.

The bigger the resistance of a component, the smaller its share of the total d/span>

The total resistance is the sum of all the resistances.

25.) Study the diagram carefully. Using the information given in the circuit, what is the potential difference across the battery?

4 V.

10 V.

16 V.

60 V.

26.) Two light bulbs of resistance 2 Ohms and 3 Ohms are connected in series with a 10 Volt battery. What is the potential difference across the 2 Ohm bulb?

4 V.

6 V.

10 V.

20 V.

27.) A series circuit contains three resistors. If the resistance of resistor "A" is 3 ohms, and "B" is 6 Ohms, what is the resistance of "C", if the total resistance of the circuit is 11 Ohms?

1 Ohms.

2 Ohms.

3 Ohms.

9 Ohms.

28.) Which of the following statements is NOT true about series circuits?

Ammeters can be placed anywhere in a series circuit.

Voltmeters must always be connected in parallel around components.

If a bulb goes in a set of Christmas tree lights that are wired in series, then the rest will remain on.

The components in a series circuit can be small and low voltage because the total voltage is shared between them all.

29.) Study the diagram carefully. It shows two 1.5 V bulbs connected in series to a 1.5 V cell. The bulb "X" has a switch connected in parallel with it. What will be observed when the switch is closed?

‘X’ will glow brighter and ‘Y’ goes out.

‘Y’ will glow brighter and ‘X’ goes out.

Both lamps will go out.

Both lamps glow less brightly.

Parallel Circuits

30.) Study the diagrams carefully. Which of the circuits has all the lamps connected in parallel?

a

b

c

d

31.) Which of the following statements is NOT true about parallel circuits?

The total current flowing round the circuit is shared by the separate branches in the circuit.

The voltage is the same across all components in the parallel circuit.

The bigger the resistance of a component, the smaller the current that will flow through it.

The total resistance of the circuit is more than the branch with the biggest resistance.

32.) Study the diagram carefully. It shows four identical ammeters connected in a circuit. Which of the following statements about the readings on the ammeters is correct?

The reading on A1 is the same as on A2.

The reading on A2 is less than A3.

The reading on A3 is less than A4.

The reading on all the ammeters is the same.

33.) The diagram shows two voltmeters connected with a 10 Ohm resistor. If the reading on V1 is 20 Volts, what is the reading on V2?

10V.

20V.

30V.

40V.

34.) Which of the following statements is NOT true about parallel circuits?

Voltmeters are connected in series in a parallel circuit.

Ammeters can be placed in each branch to measure the different currents flowing through each branch.

Parallel connection allows each branch to be turned on and off separately.

Parallel connection gives every branch the full voltage from the battery.

35.) Study the diagram carefully. One of the lamps has fused and caused the others to go out. Which lamp has fused?

a

b

c

d

Static Electricity

36.) When a plastic comb is rubbed on some cloth, it is found that the comb attracts small pieces of paper. Why does this happen?

The paper is magnetc

The comb is dried by rubbing.

The comb is charged by rubbing.

The comb is magnetised by rubbing.

37.) An acetate comb is given a positive charge by rubbing it with a piece of cloth. The cloth is then tested for electric charge. What charge would you expect the cloth to have?

No charge.

A positive charge less than that on the cob/span>

A positive charge equal to that on the cob/span>

A negative charge equal to that on the cob/span>

38.) Which of the following statements is NOT true about the build up of static electricity caused by friction?

Two insulating materials rubbed together, will scrap off electrons from one; making it +ve, and put onto the other.

The direction in which electrons are transferred from one material to another does not depend on the materials involvd

When a polythene rod is rubbed with a cloth, electrons move from the cloth, making the rod negative.

When an acetate rod is rubbed with a cloth, electrons move to the cloth, leaving the rod positive.

39.) Which of the following statements IS true about electrostatic charges?

Positive static charges are produced by electrons moving away elsewhere.

Two things with opposite electric charges will repel each other.

Two things with the same electric charge will attract each other.

The forces between two objects with electrostatic charges become greater the further apart they are.

40.) The diagram shows four plastic rods that are used in an electrostatic experiment. Each rod may be charged or uncharged and it is found that "W" repels "X", but "Y" exerts no force on "Z". What does this indicate about the nature of the charge on the plastic rods?

‘W’ and ‘X’ are both positive. ‘Y’ and ‘Z’ are both negative.

‘W’ and ‘X’ are both negative. ‘Y’ and ‘Z’ are both Positive.

‘W’ and ‘X’ are unchargd‘Y’ and ‘Z’ have like charges.

‘W’ and ‘X’ have like charges. ‘Y’ and ‘Z’ are unchargd

41.) Charge tends to be induced in an uncharged object, when a charged object is brought near the uncharged object. This is because electrons in the uncharged object move away or towards the charged object. Which of the following statements is the correct result of this?

The new arrangement of charge always makes the two objects move further apart.

The new arrangement of charge always makes the two objects pull together.

The two objects will either pull together or push apart.

There are no forces acting on the objects, so nothing will happen.

42.) Which of the following statements is NOT true about high voltages?

Air does not conduct electricity, so there is no danger of big sparks leaping from overhead cables to Earth.

The greater the charge on an object, the greater the voltage between it and the Earth.

If a voltage is big enough, a spark will jump between the object and the Earth.

A charged object can be discharged safely by connecting it to Earth with a conductor.

43.) Photocopiers use static charge to attract toner to where it is needed on the paper. Spray painting cars uses a similar methdThe spray nozzle is connected to a +ve terminal, making the paint positively chargdHow is the paint then attracted to the car?

The car is magnetised.

The car is positively chargd

The car is negatively charged or connected to Earth.

The car is positively charged or connected to Earth.

44.) In order to remove dust particles from the emissions made by a factory, charged plates are placed inside a chimney. Why does this arrangement work?

The dust particles are attracted to the plates.

The dust particles are magnetised by the plates.

The dust particles are repelled by the plates.

The dust is filtered by the plates.

45.) A car can gain a charge as air rushes over, rubbing off electrons from it. This charge can give you a shock if you touch the outside. Why is this?

Electrons flow from Earth and then through you to neutralise the negative charge on the car.

Electrons flow from the car and then through you to neutralise the negative charge on the car.

Electrons flow from Earth and then through you to neutralise the positive charge on the car.

Electrons flow from the car and then through you to neutralise the positive charge on the car.

46.) When synthetic clothes are dragged over each other in a tumble drier, static charges build up on them. These forces of attraction cause the clothes to stick together and little sparks as the charges rearrange themselves. How are these charges formed in the first place?

Protons are rubbed off some objects and put onto others.

Electrons are rubbed off some objects and put onto others.

Positive charges are rubbed off some objects and put onto others.

Positive and negative charges are rubbed off some objects and put onto others.

Energy in Circuits

47.) Anything that supplies electricity is also supplying energy. Which of the following statements is NOT true?

Energy is transferred by the electric circuit to components such as lamps, buzzers and LED's.

Components in the circuit convert electrical energy into other forms of energy. These are often heat, light, sound or movement.

Five sources of electrical energy are cells, batteries, generators, solar cells and motors.

If a circuit is broken there will be no current flow and therefore no transfer of energy.

48.) All resistors produce heat when a current flows through them. Which of the following statements is NOT true?

The more current that flows, the less heat is producd

A bigger voltage means more heating because it pushes more current through.

A higher resistance means less heat is producdThis is because a higher resistance means less current will flow.

Heat produced can be measured by putting a resistor in a fixed mass of water and measuring the increase in temperature.

49.) Electricity can produce four effects. Which of the following components will NOT produce the described effect?

LED - Motion.

Speaker - Soud/span>

Light Bulb - Light.

Kettle - Heat.

50.) Energy is transffered to the electric charge at the power source. The charge gives up its energy when voltage changes as it travels through any voltage components elsewhere in the circuit. Which of the following statements is true?

The smaller the change in voltage, the more energy is transferred for a given amount of charge passing.

A battery with a smaller voltage will supply more energy to the electricity for every coulomb of charge which flows round it.

A battery with a bigger voltage will supply less energy to the electricity for every coulomb of charge which flows round it.

The bigger the change in voltage, the more energy is transferred for a given amount of charge passing.

51.) What is Charge (Q) measured in?

Coulombs.

Watts.

Joules.

Amperes.

52.) Which of the following is equivalent to one coulomb per second?

1 Volt.

1 Ampere.

1 Joule.

1 Watt.

53.) Which of the following is the energy transferred per unit charge passed?

Resistance.

Power.

Voltage.

Current.

54.) Which of the following formulae correctly relates voltage, charge and energy?

E = QV (Energy = Charge x Voltage)

Q = EV (Charge = Energy x Voltage)

V = EQ (Voltge = Energy x Charge)

E = Q/V (Energy = Chrage / Voltage)

55.) A circuit uses a total charge of 5000 coulombs. The supply to the circuit has a potential difference of 25v. How much energy does the circuit transfer?

125,000J.

5025J.

200J.

0.005J.

56.) Which of the following formulae correctly relates current, charge and time?

Q = I/t (Charge = Current / Time)

t = IQ (Time = Current x Charge)

I = Qt (Current = Charge x Time)

Q = It (Charge = Current x Time)

57.) The current flowing around a circuit is measured to be 3.5 Amps. If this circuit is left on for one minute, what will be the total charge used?

12,600 Coulombs.

210 Coulombs.

35 Coulombs.

3.5 Coulombs.

Electricity Bills

58.) The Units that your electricity meter counts in are known as Kilowatt-hours. What is a Kilowatt-hour?

A Kilowatt-hour is a unit of power.

A Kilowatt-hour is a unit of time.

A Kilowatt-hour is the amount of electrical energy used by a 1KW appliance left on for 1 hour.

A Kilowatt-hour is the amount of power used by a 1KW appliance left on for 1 hour.

59.) How many Joules of energy does a Kilowatt-hour represent?

3,600,000J.

3,600J.

1,000J.

1J.

60.) If the price per Unit of energy is 6p, what would be the cost of leaving a 2kW fire on for 3 hours?

£36

£3.60

36p

3.6p

Mains Electricity

61.) Pets and electricity are a hazard waiting to happen. Damaged plugs or too many plugs in one socket are also electrical hazards. Which of the following is NOT an electrical hazard?

Water near sockets.

Earth wires connected to metal pipes.

Lighting sockets without bulbs in.

Long cables, frayed cables and cables in contact with something hot or wet.

62.) It is very important to wire a plug safely. Which of the following pieces of advice about wiring a plug is dangerous?

The right coloured wire should be connected to the correct pin and firmly screwed in.

The fuse should be the correct rating for the appliance which the plug is connected to.

The cable grip should be tightly fastened over the cable outer layer.

So that the wires make good contacts with the pins, it is advisable to have bare wires showing inside the plug.

63.) In a normal three-pin plug, where is the fuse connected?

In the Neutral led/span>

In the Live led/span>

In the Earth led/span>

Between the Live and Earth leads.

64.) Study the diagram carefully. It shows the inside of a mains plug with one of the connections marked ‘X’ and another ‘Y’. Which of the statements below is correct?

X - Earth (Green and Yellow), Y - Neutral (Blue).

X - Live (Brown), Y - Neutral (Blue).

X - Neutral (Blue), Y - Live (Brown).

X - Live (Brown), Y - Earth (Green and Yellow).

65.) The live wire has touched the earthed metal case of an electric toaster. Which of the following is the most likely result?

The fuse wire melts.

The earth wire melts.

The neutral wire melts.

The live wire melts.

66.) Why is the outer casing of an electric toaster connected to earth?

To complete the circuit.

To prevent the fuse from burning out.

To prevent the toaster from overheating.

To prevent a serious electric shock in the event of a fault developing in the toaster.

67.) It is important to have the correct fuse for an appliance. Which of the following statements is true about the rating of a fuse?

Fuses should be rated as near as possible, but slightly higher than the normal operating current.

Fuses should be rated as near as possible, but slightly lower than the normal operating current.

The fuse being used should always be a 30 Amp fuse in any home appliance.

The fuse being used does not matter, as long as it is rated below the normal operating current.

68.) Which of the following statements about earthing is NOT true?

A double insulated appliance has a plastic casing and no metal parts showing.

Appliances with double insulation do not need to be earthd

Appliances with metal cases do not need to be earthd

An appliance that is earthed has its case attached to the earth wire.

The National Grid

69.) All power stations that use fuel basically work in the same way. Which of the following statements is the correct order of operation?

Steam -> Boiler -> Fuel -> Turbine -> Generator -> Transformer -> National Grd

Steam -> Boiler -> Fuel -> Generator -> Turbine -> Transformer -> National Grd

Fuel -> Boiler -> Steam -> Turbine -> Generator -> Transformer -> National Grd/span>

Fuel -> Boiler -> Steam -> Generator -> Turbine -> Transformer -> National Grd/span>

70.) Which of the following statements is NOT true about the National Grid?

The National Grid is the network of pylons and cables that covers the whole country.

It carries electricity from the power stations to where it is needed in homes and industry.

It enables power to be generated anywhere on the grid and to then be supplied anywhere else on the grd

Electricity is transmitted using DC so that transformers will work.

71.) A local transformer substation changes the electrical supply to a village. The purpose of the substation is to decrease one of the quantities below. Which one?

Power.

Charge.

Voltage.

Current.

72.) Which of the following statements is NOT true about the transmission of electricity?

Using a high current to transmit electricity wastes a great deal as heat, due to the resistance of the cables.

The formula for power loss due to resistance in the cables is (P = I²R).

If the current is made 100 times bigger, the loss of power will be 10 times smaller.

It is much cheaper to boost the voltage up to 400,000V and keep the current very low.

Mixed Bag

73.) Several appliances are often run from one socket by using an adapter. If the mains supply is 240V and an adapter has a 10A fuse, which combination of appliances could be run from the adapter?

A 2000W fire and a 500W toaster.

A 1500W sun lamp and a 600W hair dryer.

A 600W hair dryer and a 2kW fire.

A 2kW kettle and a 450W mixer.

74.) A toaster has an electrical power rating of 1000 Watts. If it is left on for 60 seconds, how much energy will be transferred?

60 Joules.

6000 Joules.

6000 Kilojoules.

60 Kilojoules.

75.) Which of the following combinations of apparatus would be needed to determine the electrical power of a heating coil?

A thermometer and a balance.

An ammeter and a thermometer.

An ammeter and a voltmeter.

A voltmeter and a thermometer.

76.) Static can build up as fuel flows out of a pipe, paper drags over rollers, or when grain shoots out of pipes. This is a serious hazard as the build up of static can lead to a spark, which in these dusty or fumy environments may cause an explosion. How can the build up of static be stopped?

Make the pipes and rollers from a good insulator such as polythene, so that charges do not build up.

Make the pipes and rollers from a good insulator such as acetate, so that charges do not build up.

Make the pipes and rollers from a good conductor such as metal, so that the charge is conducted away.

Make the pipes and rollers from any insulator, so that charges do not build up.

77.) A 3-pin plug has metal parts made from copper or brass because these are very good conductors. Which of the statements below is NOT a feature of the standard 3-pin plug?

An Earth pin which allows electricity to flow to Earth.

A fuse which melts if too high a current flows.

A cable grip to prevent the wires being pulled loose.

A metal cover to insulate the user from the wires.

78.) Two light bulbs of resistance 6 Ohms and 3 Ohms are connected in series making a total of 9 Ohms of resistance. When connected to an 18 Volt battery. What is the current through the 6 Ohm bulb?

a

a

a

1a

79.) A circuit contains a resistor with value 20 Ohms. The current flowing in the circuit is 5 Amps. What is the total potential difference of the cells in the circuit?

0.25 Volts.

4 Volts.

100 Volts.

1000 Volts.

80.) A series circuit contains a resistors, "A", and a 24 Volt battery. If 3 Amps flow around the circuit, what is the resistance of resistor "A"?

72 Ohm.

3 Ohms.

8 Ohms.

21 Ohms.

81.) The diagram shows a circuit. If 3A of current is flowing through ammeter A1 how much would be flowing through ammeter A2?

3 Amps.

2 Amps.

1.5 Amps.

1 Amp.

82.) A circuit uses a total charge of one million coulombs. What is the circuits supply voltage if it transfers 2500 Joules of energy?

2500,000,000 Volts (2.5 x 10^9).

400 Volts.

40 Volts.

0.0025 Volts.

83.) A 12 Watt torch bulb is lit by connecting it to 4 x 6 Volt batteries. 0.5 Amps flow through the torch when it is on. What resistance does the torch bulb have?

48 Ohms.

24 Ohms.

6 Ohms.

3 Ohms.

84.) Study the diagram carefully. It shows the reading on an electricity meter. How many units of energy does the reading represent?

540,000 Megajoules.

150,000 units.

1500,000 units.

150 units.

85.) For lightning to occur, a huge voltage must exist between a cloud and the Earth. For this voltage to grow in size, what charge do the raindrops fall to the Earth with?

No Charge.

Negative Charge.

Positive Charge.

Positive or Negative Charge.

86.) A circuit uses a total charge of 3600 coulombs in 24 minutes. What will be the current flowing around the circuit?

8640a

15a

2.5a

2.5a

87.) The diagram shows similar cells, ammeters and resistors. If the cells deliver a total potential difference of 12 Volts and a current of 1.8 Amps flows through A1, what is the current flowing through A2?

0.a

0.a

1.a

1.a

88.) Study the diagram carefully. It shows part of the scale of a voltmeter. What is the reading on the voltmeter?

5.025 Volts.

5.05 Volts.

5.25 Volts.

5.50 Volts.

89.) The diagram shows four plastic rods that are used in an electrostatic experiment. Each rod may be charged or uncharged and it is found that ‘W’ repels ‘X’, but ‘Y’ exerts no force on ‘Z’. What does this indicate about the the forces between the pairings?

‘X’ would attract ‘Y’ and repel ‘Z’.

‘X’ would repel ‘Z’ and attract ‘Y’.

‘W’ would repel ‘Y’ and ‘Z’.

‘W’ would attract ‘Y’ and ‘Z’.

90.) The diagrams show resistors of 3 Ohm and 6 Ohm connected in different arrangements. Which arrangement has the smallest total resistance? To calculate the resistance of resistors in parallel, use: (1/R) = (1/R1) + (1/R2)

a

b

c

d

91.) In an electric circuit, a bulb is to be fitted as a warning light and it is essential that the resistance is as low as possible. Which bulb should you use?

4W, 16V car bub/span>

4W, 8V motorbike bub/span>

4W, 4V torch bub/span>

4W, 2V torch bub/span>

92.) The current flowing around a circuit is measured to be 500mA (0.5A). If the total charge used is 6000 coulombs, how long was the circuit on for?

12 minutes.

12 seconds.

12,000 minutes.

12,000 seconds.

93.) Study the diagram carefully. Resistors of 2 Ohm and 4 Ohm are connected as shown. Use the formula in the diagram, and others that you have learnt, to answer this question. What would the potential difference across the arrangement be, if the current entering is 2 Amps?

5 Volts.

8 Volts.

10 Volts.

16 Volts.

94.) A straight-line voltage - current graph is plotted with voltage along the horizontal axis (x), and current up the vertical axis (y). The gradient of the line is 0.0625. What is the resistance of the component under test?

0.0625 Ohms.

16 Ohms.

It is not possible to calculate the resistance without a value for the current.

It is not possible to calculate the resistance without a value for the voltage.

95.) The diagrams show resistors of 2 Ohm and 4 Ohm connected in different arrangements. Which arrangement has a total resistance of 4 Ohms? To calculate the resistance of resistors in parallel, use: (1/R) = (1/R1) + (1/R2)

a

b

c

d

96.) A circuit transfers 720 Joules of energy. If the supply voltage is 240 Volts, how much charge will have flown around the circuit?

0.33 Coulombs.

3 Coulombs.

1.728 x 10 ^ 5 Coulombs.

1.728 x 10 ^ -5 Coulombs.

97.) Study the diagram carefully. It shows an electricity bill. Work through the bill filling in the missing gaps. What is the final total for this bill?

£20,110.08

£45.57

£76.23

£53.38

98.) Fuses are available which melt when the current through them exceeds 2, 5, 13, 15 or 30 Amps. Which of these would be most suitable for an electric fire rated at 2.5kW, if the supply voltage is 240V?

a

a

1a

1a

99.) A circuit has a total resistance of 200 Ohms. The total voltage of the cells in the circuit is 6 Volts. How much current is flowing in the circuit?

0.03 mA.

30 mA. (=0.03A)

33.33a

1200a

100.) A 2.5kW heater is connected to the 240V mains supply. The cable connecting the plug to the heater has worn thin in places and so needs replacing. From the list below, which is the most suitable replacement cable?

Largest safe current - 15A

Largest safe current - 10A

Largest safe current - 6A

Largest safe current - 3A

Right:

0


Wrong:

0

Attempts:

0